Mobile communication method and radio base station

Abstract

A mobile communication method according to the present invention, includes the steps of: (A) assigning a radio resource for a PRACH in each cell within a mobile communication system in which cells are synchronized; and (B) performing, at a mobile station (UE), a random access procedure by transmitting an RA preamble via the PRACH using the radio resource assigned in each cell, wherein in the step (A), as the radio resource for a PRACH, a resource block in a different sub-frame is assigned between adjacent cells.

1 . A mobile communication method, comprising the steps of:
 (A) assigning a radio resource for a physical random access channel in each cell within a mobile communication system in which cells are synchronized; and   (B) performing, at a mobile station, a random access procedure by transmitting a random access preamble via the physical random access channel using the radio resource assigned in each cell, wherein   in the step (A), as the radio resource for a physical random access channel, a resource block in a different sub-frame is assigned between adjacent cells.   
     
     
         2 . A mobile communication method, comprising the steps of:
 (A) assigning a radio resource for a physical random access channel in each cell within a mobile communication system; and   (B) performing, at a mobile station, a random access procedure by transmitting a random access preamble via the physical random access channel using the radio resource assigned in each cell, wherein   in the step (A), as the radio resource for a physical random access channel, a resource block in a different sub-carrier is assigned between adjacent cells.   
     
     
         3 . A mobile communication method, comprising the steps of:
 (A) assigning a radio resource for a physical random access channel in each cell within a mobile communication system in which cells are synchronized; and   (B) performing, at a mobile station, a random access procedure by transmitting a random access preamble via the physical random access channel using the radio resource assigned in each cell, wherein   in the step (A), as the radio resource for a physical random access channel, a resource block in a different sub-frame and a different sub-carrier is assigned between adjacent cells.   
     
     
         4 . A mobile communication method, comprising the steps of:
 (A) assigning a radio resource for a physical random access channel in each sector within each cell within a mobile communication system; and   (B) performing, at a mobile station, a random access procedure by transmitting a random access preamble via the physical random access channel using the radio resource assigned in each sector, wherein   in the step (A), as the radio resource for a physical random access channel, a resource block in a different sub-frame is assigned between adjacent sectors under the control of a radio base station.   
     
     
         5 . A radio base station used in a mobile communication system in which cells are synchronized, comprising:
 a resource assignment unit configured to assign a radio resource for a physical random access channel, in a cell under the control of the radio base station; and   a random access procedure unit configured to perform a random access procedure upon receipt of a random access preamble via the physical random access channel using the radio resource assigned by the resource assignment unit from a mobile station located in the cell, wherein   the resource assignment unit is configured to assign a resource block in a sub-frame different from a cell adjacent to the cell, as the radio resource for a physical random access channel, in the cell.   
     
     
         6 . A radio base station used in a mobile communication system, comprising:
 a resource assignment unit configured to assign a radio resource for a physical random access channel, in a cell under the control of the radio base station; and   a random access procedure unit configured to perform a random access procedure upon receipt of a random access preamble via the physical random access channel using the radio resource assigned by the resource assignment unit from a mobile station located in the cell, wherein   the resource assignment unit is configured to assign a resource block in a sub-carrier different from a cell adjacent to the cell, as the radio resource for a physical random access channel, in the cell.   
     
     
         7 . A radio base station used in a mobile communication system in which cells are synchronized, comprising:
 a resource assignment unit configured to assign a radio resource for a physical random access channel, in a cell under the control of the radio base station; and   a random access procedure unit configured to perform a random access procedure upon receipt of a random access preamble via the physical random access channel using the radio resource assigned by the resource assignment unit from a mobile station located in the cell, wherein   the resource assignment unit is configured to assign a resource block in a sub-frame and a sub-carrier different from a cell adjacent to the cell, as the radio resource for a physical random access channel, in the cell.   
     
     
         8 . A radio base station used in a mobile communication system, comprising:
 a resource assignment unit configured to assign a radio resource for a physical random access channel, in a sector within a cell under the control of the radio base station; and   a random access procedure unit configured to perform a random access procedure upon receipt of a random access preamble via the physical random access channel using the radio resource assigned by the resource assignment unit from a mobile station located in the sector, wherein   the resource assignment unit is configured to assign a resource block in a sub-frame different from a sector adjacent to the sector, as the radio resource for a physical random access channel, in the sector.   
     
     
         9 . The mobile communication method according to  claim 1 , wherein
 in the step (A), the resource block assigned as the radio resource for a physical random access channel is determined in each cell, depending on a configuration or a type of each cell.   
     
     
         10 . The mobile communication method according to  claim 4 , wherein
 in the step (A), a resource block assigned as the radio resource for a physical random access channel is determined in each sector, depending on a configuration or a type of each cell or each sector.   
     
     
         11 . The radio base station according to  claim 5 , wherein
 the resource assignment unit is configured to determine a resource block assigned as the radio resource for a physical random access channel, in each cell, depending on a configuration or a type of each cell.   
     
     
         12 . The radio base station according to  claim 8 , wherein
 the resource assignment unit is configured to determine a resource block assigned as the radio resource for a physical random access channel, in each sector, depending on a configuration or a type of each cell or each sector.   
     
     
         13 . The mobile communication method according to  claim 2 , wherein
 in the step (A), the resource block assigned as the radio resource for a physical random access channel is determined in each cell, depending on a configuration or a type of each cell.   
     
     
         14 . The mobile communication method according to  claim 3 , wherein
 in the step (A), the resource block assigned as the radio resource for a physical random access channel is determined in each cell, depending on a configuration or a type of each cell.   
     
     
         15 . The radio base station according to  claim 6 , wherein
 the resource assignment unit is configured to determine a resource block assigned as the radio resource for a physical random access channel, in each cell, depending on a configuration or a type of each cell.   
     
     
         16 . The radio base station according to  claim 7 , wherein
 the resource assignment unit is configured to determine a resource block assigned as the radio resource for a physical random access channel, in each cell, depending on a configuration or a type of each cell.